Ratchet-drill.



P. E. FARLEY. RATGHET DRILL.

APPLIoATIoN FILED AUG. 25. 1909.

977,176. Patented Nov. 29, 1910.

UNITED STATES PATENT QFFTCE.

FRED E; FARLEY, OF GREENFIELD, MASSACHUSETTS, ASSIGNOR TO GOODELL-PRATTCOMPANY, OF GREENFIELD, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

RATCHET-DRILL.

To all whom it may concern:

Be it known that I, FRED E. FARLEY, a citizen of the United States,residing at Greenfield, Massachusetts, have invented new and usefulImprovements in Ratchet- Drills, of which the following is aspecification.

My invention relates to improvements in ratchet drills of that type inwhich means are provided by which the speed of the drill may be readilychanged, and also means by which different ratchet motions may beimparted.

The invention comprises the novel construction and arrangement andcombination of parts hereinafter described and particularly set forth int-he appended claims.

A drill constructed in accordance with my invention is illustrated inthe accompanying drawings, in which- Figure 1 is an elevation of thedrill; Fig. 2 is an enlarged longitudinal sectional view; and Figs. 3, 4and 5 are views of details.

Referring by reference characters to the above drawings, the numeral 1designates the frame of the drill having the usual breast plate 2, andtransverse bearing sleeve 3. The frame member is provided with a dividedportion forming two arms or side members 1, only one of which appears inside elevation, and between which is located the mechanism for changingthe speed or motion of the spindle. This speed changing mechanismcorresponds to the mechanism illustrated and described in Letters Patentof the United States #557,328, dated March 31, 1896, and a particulardescription thereof herein is deemed unnecessary. Vithin the bearing 3is rotatably mounted a hollow or tubular sleeve 4, which carries, at oneend, a cran 5 provided with a suitable crank handle 6, by the movementof which motion is imparted to the drill. On this sleeve are rotatablymounted the driving gears 7 and S, which have inner and outer annularrings of gear teeth or racks, as indicated at 7a, 7b, Sa and 8b,respectively. These inner and outer racks mesh with inner and outerbeveled gears 9 and 10 rotatably journaled upon the drill holder spindle11, and designed to be alternately locked to said spindle by means ofthe clutch member 12, so that accordingly as the clutch member connectsthe gear 9 or the gear 10 to the spindle, the speed imparted to theSpecification of Letters Patent.

Application filed August 25, 1909.

Patented Nov. 29, 1910. Serial 110.514,565.

drill will be relatively slow or fast as described in said LettersPatent.

Within the hollow sleeve 4 is located a longitudinally movable cylinder13, which is yprovided with a plurality of longitudinal recesses inwhich are seated dogs or pawlsA which are designed to engage withnotches 14C formed in the inner surfaces of the hubs of the gear wheels7 and 8, as shown in detail in Fig. 5. I provide, in connection withthis cylinder, pawls corresponding in nurnber to the number ofvariations which I desire to make in the transmission between the crankhandle and the spindle. In the present drawings, I have shown threepawls, as this number is amply suthcient for the purposes ofillustration, but I wish it understood that I do not limit myself to anyspecial number, as the number may be varied according to conditions. Thepawls are designated 15, 16 and 17, the pawl 17 being shown in detail inFig. 3. They are provided with rounded edges 18 designed to rest againstthe bottoms of the grooves, and with notches 19, which receive a splitring 2O which rests in an annular groove 21 in the cylinder, and, by itsengagement with the notches 19 of the pawls, holds themin place andagainst longitudinal movement. Beneath each pawl is located a spring 22which tends to force the pawl normally outward. The spring associatedwith the pawl 17 is similar to the spring shown associated with thepawls 15 and 16. The pawls are adapted to be forced by their springsoutward through slots formed in the hollow sleeve or shaft 1, when theyare brought into coincidence with the slots, and they are brought intosuch coincidence by the movement of the cylinder 13 longitudinallywithin the sleeve.

It will be seen, from an examination of Fig. 2, that the pawls 15 and`16 have their portions which are adapted to engage with the notches ofthe hub of the wheel 7, beveled in opposite directions, and located theone farther to the right than the other. These notch engaging portions,which are designated 15a, 16a and 17a, are provided with inclined ends,as shown, so that when the cylinder is moved longitudinally within thesleeve, the requisite distance, the inclined end of any particular dogwhich eX- tends through the slot in the crank sleeve will ride on andagainst the end of the slot,

and cause the dog to be forced inwardly. If pawl 15 be projected throughits slot, and pawls 16 and 17 be held retracted, it will be seen that aleft hand ratchet motion is obtained. lf pawls 15 and 16 are bothallowed to project through their slots, then a positive motion iscommunicated by. the crank through the gearing of the spindle either ofright or left hand motion, according to the direction of rotation of thecrank. If pawl 16 only is allowed to project through the slot, then aright hand motion is obtained, while if pawls 16 and 17 are both allowedto project through the slots and engage with the notches in the hubs ofthe gears 7 and 8, then an oscillating movement of the crank handlewill, through the gearing, impart a continuous right hand motion to thegears.

In order to move the cylinder longitudinally within the sleeve 'to causethe pawls to move into and out of the position, as thus described, Iprefer to provide a spiral groove 20 in the cylinder. which is engagedby a pin 21 carried by a collar 22, this pin projecting` through acircumferential slot 23 in the sleeve or tubular shaft l. The collar 22is milled on its outer' periphery, and designed to be rotated so as tocaus-e the engagement of the pin with the Vspiral slot 20 to move thecylinder endwise. The collar is provided on its base with indieatingmarks designed to be brought opposite a corresponding mark on thecylinder to indicate when the parts are in the proper position to givecertain motions. Such indicating marks are shown in Fig. 4, L indieatingthe position for left hand ratchet .mo-

tion, P the position for positive motion, R the position for right handratchet motion, and DR the position for double ratchet motion. Anyindicating characters, however, can be used as desired.

Having thus described my invention what I claim is 1. The combination ina breast drill, of a frame, a spindle journaled therein, a crank shaftalso journaled in said frame, a bevel gear on the spindle, a pair ofbevel gears journaled on the shaft and meshing with the gear on saidspindle, and means carried by said shaft adapted to be moved into andout of engagement with said second mentioned bevel gears for alteringthe character of movement of said spindle with respect to said shaft,substantially as described.

2. The combination in a breast drill, of a frame, a spindle journaledtherein, a hollow crank shaft journaled in said frame, and extending atan angle with respect to said spindle, a bevel gear on said spindle,bevel gears journaled on said shaft meshing with said first mentionedbevel gear and having their hubs provided with internal notches, a pawlcarrier mounted within said hollou7 shaft and having pawls, said shafthaving slots through which the pawls may project to engage the notchesin *the gear hubs, and means for projecting and retracting said pawls,substantially as described.

3. The combination in a breast drill, of a frame, a spindle journaledtherein, a hollow crank shaft ournaled in said frame, and extending atan angle with respect to said spindle, a bevel gear on the spindle, abevel gear journaled on the shaft, and having a notched hub, said shafthaving slots therein, a pawl carrier longitudinally movable within thehollow shaft, and having pawls tending to project outwardly through saidslots to engage the notches in the gear, said pawls having bevel endsfor engaging the ends of the slots, and means for moving the pawlcarrier longitudinally within the hollow shaft, substantially asdescribed.

d. The combination in a breast drill, of a frame, a spindle journaledtherein, a hollow crank shaft journaled in said frame, a bevel gear onthe spindle` a bevel gear journaled on the shaft, and having' a notchedhub, said shaft having slots therein, a pawl carrier longitudinallymovable within the hollow shaft, and having pawls tending to projectoutwardly through said slots to engage the notches in the gear, saidpawls having bevel ends for engaging the ends of the slots, and meansfor moving the pawl carrier longitudinally Within the hollow shaft, saidmeans comprising a sleeve rotatably mount'- ed on the shaft and having apin engaging a spiral groove in the pawl carrier, substaib tially asdescribed.

The combination, in a breast drill, of a frame, a spindle journaledtherein, a hollow driving shaft journaled in said frame, a gearoperatively associated with said spindle, a gear operatively mountedupon said shaft and meshing with said first-mentioned gear, means foroperatively connecting said second-mentioned gear to said shaft when thelatter is rotated in one direction only and means for operativelyconnecting said second-mentioned gear to said shaft when the latter isrotated in the opposite direction only.

The combination, in a breast drill, of a frame, a bit spindle journaledtherein, a hollow shaft jourualed in said frame, a gear on the spindle,a gear journaled on the shaft and meshing with said first gear, saidshaft being provided with slots, a pawl carrier movably positionedwithin said shaft and pawls mounted upon said carrier and adapted topass through said slots into operative engagement with saidsecondmentioned gear, said slots being so positioned that either one orboth of said pawls may be caused to engage said gear.

'7. The combination, in a breast drill, of a frame, a spindle journaledtherein, a holevans jg loW crank shaft journaled in said frame, a l aframe, a spindle journaled therein, a holgear on the spindle, a gearjournaled on the shaft and meshing With said first gear and having anotched hub, said shaft having slots therein, a paWl carrier movablyposiw tioned Within said shaft and a pair of paWls mounted upon saidcarrier and-adapted to pass through said slots to engage the notchedhub, said paWls having oppositely inclined notched engaging surfaces,said slots being so positioned that either one or both of said paivlsmay be caused to engage said notched hub.

8. The combination, in a breast drill, of a frame, a spindle journaledtherein, a shaft journaled therein, a gear mounted upon said spindle, apair of gears journaled in said shaft and meshing with saidfirst-mentioned gear, said pairs of gears being positioned upon oppositesides of said frame, means for engaging one of said pair of gearstocause rotation thereof When the shaft is rotated in one direction only,means for engaging the other of said pair of gears to cause rotationthereof when the shaft is rotated in the opposite direction only andmeans for rendering one only or both of said engaging means operative.

9. The combination, in a breast drill, of

t low crank shaft journaled therein, a gear mounted on said spindle, apair of gears having notched hubs journaled on said shaft and meshingWith said first-mentioned gear, said shaft being provided with slots, apaWl carrier movably positioned Within said shaft and a pair of pawlsmounted upon said carrier and adapted to be moved through said slotsinto engagement with said notched hubs to lock the gears to said shaft,one of said pawls being beveled to cause the gear with which it isassociated to be rotated When the shaft is rotated in one directiononly, the other of said paivls being beveled to cause the gear withWhich it is associated to be rotated when the shaft is rotated in theopposite direction only, said slots being so positioned that one only orboth of said pair of pavvls may be moved into operative position.

In testimony 'whereof l have signed my name to this specification in thepresence of two subscribing Witnesses.

FRED E. FARLEY.

Witnesses J. A. VAN SLYKE, C. B. VAN SLYKE.

